Doppler-profile escape factors and escape probabilities for the cylinder and hemisphere

Escape factors have been computed and tabulated for photons emitted within cylinders and hemispheres and absorbed/scattered according to the Doppler-profile function. The mean escape probability for Doppler-profile photons emerging normal to the axis of a cylinder has also been obtained. The assumptions under which these quantities are derived are described. Logistic-function approximations for the three types of escape probability are fitted to the tabulated values. Typographical errors were found and corrected in an earlier expression quoted in the literature. (C) 1997 Elsevier Science Ltd.